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W. TRAPNELL POWER HAMMER' Filed Aug. 19. 1925 SVSheecs-Shveet 6 Milf/221m 'aprl @WM I 61cm m1 y l Patented Nov. 1, 1927.

Unirse: STATES Partnr orti WILLIAM TRAPNELL, or Wasson, wnsr vIneIi\Ti;ifi 4 :POWER HAMMER. K

applicati@ inea August 19, i925. semi No. 51,193.

My invention relates to improvements in nates the cranlrcase casting having an uppower hamm-ers of the type capable ot use per horizontal flange 12 and a lower horitor tamping, drilling, cutting7 riveting, and Zontal flange 13 preferably cast 'integrally the 1iketherewith. i cylinder 14 is secured to the 60 An important object ot my invention is -flange 12and has adep'ending` skirt portion the provision ot a device of the aboveu 15v extending down into 'the bore ot the mentioned character which will be a power crank case. unit7 complete in itself and therefore readily rTwo' 'concentric and preferably cylindrical portable' t walls' 16 lhave the space between them closed 55 Z0 Another object ot my invention is to proat their lower end by thetlange 12 ot the vide an improved arrangement ot the fuel crank case to which they are secured, and tank and means tor feeding said fuel. at the top by a cover plate 17 which is pro- Still another object ot my invention is vided with stopper 18. The walls 16 torni the provision ol' a device ot this character a fuel tank surrounding the cylinder 1li but 70 which is a complete compact unit which is spaced therefrom. The space within the symmetrical and easily handled, and which inner wall is closed at the top by a plate 19 may be used in any position. provided with series ot openings 2O which i 'further object oit my invention is the are adapted f to be covered and uncovered provision, in a device ot this character, ot by' a shutter plate 21 having corresponding 75 l0 vimproved means for transmitting motion to Openings and pivoted at its center by the the hammer element. bolt 22 which `isprovidcd at its outer end Another object ot my invention is to prowith alniob tor turning the plate 21 to reguvide device oi' this character which will be late the tlow ot air to the space between the inexpensive to manufacture, strong and durtank and the cylinder. A suitable handle 23 30 35 able. y is secured to the plate 20 by means oit ears 211- Oth'er objects and advantages oi my in preferably termed integrally with the vention will 'be apparentduring the course plate 20.

ot the following),` description. The crank shank consists et a pair ot stubs ln the drawings which form a part ot 25 and 25 journalled in bearings 26 which 85 this specitication and wherein like characters are arranged in the walls oi' the crank case.

oit reference `denote like or corresponding Eccentrics 27 are `arranged at the inner ends parts throughout the same, of the stubs and are provided with a Crank Figure 1 is a central vertical sectional pin 28 to which the connecting rod 29 is View through my improved tool, parts bepivotally secured at one euch and secured tof 90 ing in elevation, the pistonv 30 at its other end. lll'he outer Figure 2 is a central vertical section taken ends of the stubs 25 and 25" are tapered. rlhe at right angles to Figure 1, stnbs,` eccentrics and crank` pin are preter- Figure 3 is a top plan view of my device, ably formed integrally. On the tapered end Figure l is a bottom plan view, ot the stub 25 a tan 31 is arranged.. This 95 Figure 5 a horizontal section taken lian turns with the stub due to the key 32, above the cylinder on the line 5-5 ot Fig. 1, and is arranged within thecasing 33 formed Figure 6 is a detail perspective view `oli on the crank case casting.` The tan is comthe parts utilized for transmitting motion prised of a circular plate 3d having a hub trom the piston to the hammer, 35 at its `center and a rim 36 to which are 100 Figure@I is a sectional view of the fuel secured radially extending` blades 37 which pressure valve, may or may not be provided with a second Figure 8 is a iront elevation of the tan elerim 38. A drum 39 is secured to the outer ment, i i side oi the tan disk 34 and has a flange 110.

Figure 9 .is a sectional view et the same, In starting the motor, a rope or the like 105 J parts being in elevati0ii,and,' l i may be passed around the drum and pulled Figure 10 is a detail elevation ot the upto rotate the shalt and so turn over the per portion of a tool adapted tor use in the motor. The Yfan draws air through the openhainmer. t i ings 2O around the cylinder and cooling fins,

ln the drawingsywherein for the purpose through the channel 41 and out through the 110 of illustration is shown a preferred embodiopenings 42 in the tan casing. ment ot my invention, thenuineral 11 desig- On the" tapered end nof the stub 25 is arranged a magneto 43 which turns with the shaft and serves to balance the tool by offsetting the effect of the rotation of the fan on the end of the shaft 25. This magneto may be of any conventional construction as tor instance the Eiserne-nn magneto.. A. onductor 44 leads from the magneto to the spark plug 45 at the top. ofthe cylinder.

Straps46 surround the eccentrics 27 and have their ends bent downwardly and arranged in spaced relation. Blocks 47 are arranged between the ends of the straps and are secured in place by bolts 48. These blocks are Vprovided with openings 49 for the reception` of a pin 50 which passes through the bored end of a rod 51 and pivotally secures said rod to said blocks. The rod 51 passes through a bearing 52 in the lower flange of the crank case casting and extends into the boi-'e of a tubular casting;` 53 which is rigidly secured to the lower flange 13 by means ot an upper flange 54 which is also connected to a lower flange 55 by ineans of webs 55 which serve to strengthen the tube casting. A bushing 57 extends for the greater length ot' the tube and slidably receives a hannner ineinber 58 which has its upper end provided with an elongated recess 59 vclosed by a cap 60 which in turn has a central bore for the reception of the reduced end ot the rod 51 which is provided at its end below the cap7 with an enlarged head portion 61 whichy is shown asv screwthreaded ly secured to the end of the rod A. coil spring 62 is arranged within the recess and presses against the enlarged head (i1 of the rod 5l.

Arranged within the lower end of the bore ot the tube 53 is the tool holder 63 held in place by means` of the cap 64 secured to the lower flange 55. The tube is provided at its lower end with a second bore 65, of larger diameter than the inain bore and concentric` therewith, the bores being separated by the sleeve portion G6. The upper end of the tool holder is reduced to rit within the inner bore of the tube, and a coil spring 67 is arranged within the outer bore and bears against the shoulder formed by the reduced portion of the tool holder. The tools to be used. with the hannner have their top portions provided with bayonet slots 68 within which set screws '69 carried by the tool iolder, lit. The tool is placed in the holder and when twisted, the` screws 69 will go into the end. of thev slots 68 and will hold the tool against diplacenient.

lWhen the piston is caused to reciprocate, a. rotary inotion is given to the eccentrics 27 which causes the-rod 51., to reciprocate vertically,- due to the. straps 46. This niotion is transmitted to the haininer through the spring 62 thereby insuring'that the cohneeting rod will pass the bottoni center.' The spring also absorbs the shocks and prevents unnecessary wear on the machine. lll will be seen that the hannner will be caused lo reciprocate within a distance determined by the throw of the eccentrics. ln the position shown in Figure 2, the hannner is tree to nieve without coming into Contact with the tool holder. When it is desired to acluate the toch pressure is put upon tho machine until the tool holder is :forced up,` ae'aind the tension oil the spring:r (37. luto the path ol' f the luinin'ler. The. strength of ilu hlovv is determined b v the pressure pui upon llul'ool. This may he varied however hvchana ing;l the sprintcr 67. The upper siiirine; lli/1 also serves to cushion the blows. and thisy spiano; may be changed for greater ov lcs-:cr cushioning' eilliect.

The fuel lied through the pipe 7l) to a mixinpr valve 7lv which is illustrated as a conventional Lunkoirheiiuer valve. 'lhc supply inay be cut olll by the valve 7;? and the speed can be controlled by the thiolllc valve 73. The wiporizcd i'uel is lcd iulo [he crank case where it is compressed and l'cil into the cylinder through [he ulct pori 7l, In order to insurev proper 'feeding ol' the fue] at all times and iu all positions ol" the machine. it is desir: ble to provid i a pressure feed. To accomplish this. l provide a pipo which connects the top ot the llucl (ank with the crank case. il. alve casino 75 is arranged adjacent the crank case in the pipo line 75 and is provided with a valve 77 held in place by a springy 7S. Dui-innl the com pression stroke, a certain ainount ot co1upressed vapor willenter the valve 77 :urainst the tension oi the sin'inp' 78 and will be led to the fuel tank where it will press on the surface of the 'fuel and linsure ifuoper 'leedine in all positions of the tool. il .second valve 79 is arranged in the valve 77 and, closes a port 8O connecting;v the pipe 7F with the crank case, through the valve 77. This valve 79 is held in place hy a sprinu` Sli. llllhen the pressure in the :fuel tank becomes too greatit will discharge iuto the crank case, through the valve 79.

The charac is itgnited by the plug5` l5 aud is exhausted through the port 82. il cover Casting 83 forms an expansion chamber ad jacent the crank case and the eases escape through the openings` S4 at low velocity. This arrangement ot the orqmueion chamber serves to heat the walls ol the crank caso and raise the temperature oi" the combustible va pors therein, thereby iuc'ceaeinel the elli` ciency oli the machine.

A similar cover cantinav 85 covers the luixing valve and inlet side ot the crank casej and provided with integral ears 8G lo which a handle 87 is pivotalliv secured. tilinilar cars are `formed on the casting 8S and serve to strengthen the castin;l and as a sup port for a tripod or the like.

In operation, the plate 21 will he regulll() llltl lated accordingl to the tempeature etc. and the circulation of air around the cylinder, due to the action of the fan, will prevent undue heating of the fuel in the tank by conduction but the fuel will be .heated to a.

certain extent by radiation, but not dangerously. Thishcatlng will raise the volatility of the fuel especially advantageous in cold weather. The amount of air drawn through the space between the cylinder and fuel tank may be regulated or cut off altogether by means of the shutter 2l.

rlhe arrangement of the fuel tank, fan, magneto, etc. is such as to produce mammum compactness and symmetry, and adds to the efficiency of the machine. The machine is complete in itself and may be 'used anywhere, and the entire construction 1s of the utmost simplicity.

lllhile l have shown and described the preferred embodiment of my invention, it is to be understood that various changes in the size, shape, and arrangen'icnt of parts may be resorted to without departing from the spirit of my invention or the scope of the subioined claims.

Having described my invention. what l claim as new and desire to protect by Letters Patent is:

l. A power hammer comprising a piston and cylinder for operating said hammer, and a fuel tank arranged concentrically about said cylinder and spaced therefrom to provide an air space about the cylinder. n

2. A portable power hammer comprising a piston. and cylinder, a fuel tank arranged concentrically aboutsai-d cylinder and spaced therefrom, and a fan operated by said piston and adapted to cause a circulation of air between said cylinder and said fuel tank.

3. A portable power hammer comprising a piston and cylinder, a fuel tank arranged concentrically about said cylinder and spaced therefrom, a crank shaft connected to said piston, a fan on said crank shaft and adapted to cause a circulation of air in the space between said cylinder and said fuel tank, and means for regulating the amount of air circulation.

il. fr portable power hammer comprising u piston, cylinder and crank case. a pair of .tub shafts journaled in the walls of said rank case, eccentrics mountednpo-n the inner ends of said shafts the piston being oporatively connected to the eccentrics, straps sur rounding said eccentrics, a push rod pivotally secured to said straps and adapted to be reciprocated thereby, and a hammer element actuated by said push rod. y

5. A portable power hammer comprising a piston, cylinder and crank case, a fuel tank concentrically arranged about said cylinder` and spaced therefrom, a crank shaft, a fan arranged on one end of said crank shaft and adapted to cause a circulation of air in the space between the cylinder and tank, a magm neto mounted on the other end of said crank shaft and serving to preserve the balance of the tool, and a hammer element actuated by said crank shaft.

6. A portable power hammer comprising a piston, cylinder and crank case, a fuel tank concentrically arranged about said cylinder and .spaced therefrom, a crank shaft jour naled in the walls of the crank case, a fan arranged upon one end of the crank shaft and adapted to circulate air in the space between the cylinder and fuel tank, a magneto mounted on the other end of the crank shaft, an expansion chamber arranged adjacent the crank case and adapted to heat the walls thereof, .a push rod operatively connected to the crank shaft, and a hammer ele-- ment resiliently connected to the push rod.

7. A portable power hammer comprising a piston, cylinder and crank case, a fuel tank concentrically arranged about said cylinder and spaced therefrom, a pair of stub shafts `iournalled in the walls of the crank case, eccentrics mounted on the inner ends of the shafts, a connecting rod operatively connecting said piston and eccentrics. a fan arrange-d on the end of one of the stubs and adapted to circulate air in the space between the cylinder and fuel tank. a magneto mounted on the en d of the other stub shaft, an expansion chamber arranged adjacent the crank case and adapted to heat the walls thereof, a tubular section secured to the crank case, a hammer element therein having an elongated recess in one end, straps surl rounding the eccentrics, a push rodpivotally secured to the straps and having an enlarged end arranged in the recess in the hammer, a .spring in said recess and bearing against the enlarged end of the push rod. a tool holder arranged in the lower-end of the tubular section, and a spring normally holding said tool holder out of engage meut with the hammer. i Y

8. A portable power hammer comprising a crank case section having flanges at cach end, a cylinder mounted upon the upper flange, a piston in said cylinder, a fuel tank mount ed on said upper flange and concentrieally arranged about said cylinder in space-d relation therewith, a. crank shaft journalled in the walls of the crank case, a fan casing formed on said crank case and in communi cation with the space between said cylinder and fuel tank, a fan arranged on one` end of the crank shaft and within the fan casing. said fan being adapted to circulate air in the space between the cylinder and the fuel tank, a magneto arranged on the other end of the crank shaft and serving to preserve the half ance of the tool and means operatively connecting the piston and crank shaft.

I testimony whereof Iatiix my signature.

WILLIAM TRAPNLL. 

